Grinding machine



(No Mam. 4 sheetsShet 1.

G. W. STRATTAN & Gr. McOULLOOH. GRINDING MACHINE.

No. 415,004. Patented Nov. 12, 1889..

(No Model.) 4 Sheets-Sheet 2.

G. W. STRATTAN Kz G. MQGULLOOH. :GRINDING MACHINE.

No. 415,004. Patented Nov. 12, 1889.

' INVENTORS balm.

N. PETERS FhMo-Ulhagnplnr; Washinginn. D. Q

(No Model.) 4 SheetsSheet-3 G. W. STRATTAN' 8: G. MGCULLOOH. GRINDING MACHINE.

No. 415,904. Patented Nov. 12, 1889..

I I I I I FIG.

.\\&A I.

(No Model.) 4 Sheets-Sheet 4.

G. w. STRATTAN & G. MOGULLO-G-H.

GRINDING MAGHINE;

-No.415,004. Patepted Nov. 12., 1889..

WITNESSES: INVENTORS' N, PETERS. PlwbLithn mpher. Wnhington, D. C,

U ITED STATES.

GEORGE \V.

AT-ENT- OFFICE.

STRATTAN AND GILBERT MCCULLOCH, or ALTQONA, PENN- sYLvANIA. I

"GRINDING-MACHINE.

srncrmcnrron forming part of Letters Patent Lib/115,004, dated November 12, 1889.

Application filed February 19, 1887. Serial llo. 228,173. (No model.)

To all whom it maycoztcern:

Be it known that we, GEORGE NV. STRATIAN and GILBERT MCCULLOOH, both of Altoona,

Blaircounty, State of Pennsylvania, have in-& 'vented a certain new and. useful Improvement in Grinding-Machines, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part of this specification.

The object of our inventionis to provide a grinding-machine especially adapted for facing or finishing'the surfaces of journal or oil boxes or similar castings or forgings, and generally to impi ove the construction'of ma chines for grinding plain surfaces; and our invention consists in the i1nproved'arrange-.

ment andcombination of the various parts OfthG II IQChlIIQ shown in the drawings and hereinafter described, and particularly pointed out in the claims, reference being now had to 7 said drawings, which, as aforesaid, illusr, trate the construction of a'machine embody 'ing our improvements, and constructedin' what we believe to be thebest and most efficient manner.

Figure 1 is a perspective view of one end of our improvedmachine. Fig. 2 is a perspective view of a conical bearing used by us, as will be hereinafter explained. Fig. 3 is a side 'view of our machine. 'F iglet is a plan view of the gearing which drives the reciprocating tablesupon which the chucks holding the work are sustained. Fig. 5 is an end View of the machine. Fig. 6 is an endviewof the chuck which holds the. grinding material. Fig. 75is across-section of saidchuck, taken 'on'a' vertical-plane passing through the'center of Fig. 6, and, shoWS HJlSO, the bearing of the shaftlwhich sustains said chuck; and Fig. 8 is anenlarged view of the screw feeding-shaft' and ratchet by which the chucks 'holding thework are fed toward the grind- "ing-chucks. v Aisthefraine of'the machine; A, brackets at each end'of the frame, supporting the "tables and chucks which hold'the work. f V 'Bis the arbor supported on the machine: "frairiqals' shown, and carrying the driv'ingithe'work-holding chucks, are'secured.

D D are cone bearings keyed onto the arbor B and resting in conical bearing-surfaces in the frame. V

' E( is a pulley secured on arbor B, by means of which and a pulley e motion is given to the shaft I.

are oil-cups for the cone bearings D. v

G G are chucks secured one on'each end of the arbor-B, their pu rposebeing lo-hold the grinding material. WVe prefer to construct them in the manner shown in the drawings, and whereby they are adapted to hold small piecesll' of the grinding material. The reasons for our preference and the construction of this particular form of chuck will hereinafter he explained. i

I is a shaft running parallel to arbor B and secured in the lower part of frame A."

J J are worms secured near each end of the shaft I and gearing with, worm-wheels K K.

' L L' are shafts running'ver'tically upward from the center of gear-wheels K, said shafts extending also a short distance belowthe wheels, so as to enter supporting-sockets formed with or secured to the frame A.

M M are circular crank-pin-disks secured ontheendsofshaftsL. 'f

m are radial slots in disks M; N, a crankpin secured to disk M andadjustable in slot m.

O O are pitmen or connecting-rods secured to crank-pins N at one' end and to pins P at the other end. Y

P P are pins or arms adapted to engage the end of the pitmen O and secured to 'a' reciprocatin g table Q, said table resting and moving on a bed-plate secured to frame A, suitable guides or, being provided, and preferably made inclined, as shown, in order tosecure the reciprocating table in place and insure its moving in the proper line. The tables Q move at right angles to the arbor B, and have guides at? on their upper faces running at rightangles to the guides a, before referred 'to. In these guides a and .upon the top of the plate Q, the base-plates R, whichsupport S, S, and S are upright standards on the upper face of plate R, s, s, s, s, and 3 being screws screwed in said standards, adapted to hold and adjust the work.

T is a screw-rod, by means of which the plate R may be moved forward or backward on its guides a T is a handle for actuating this screw-rod; V, a ratchet secured on the screw-rod T; and U, a pawl pivotally secured to its support, and through said support adjustably secured on the base-plate, which sustains the reciprocating table Q.

Motion is given to our grinding-machine by means of the pulley C, which is secured on the arbor B, holding at its extremities the chucks containing the grinding material, the arbor being kept in a proper position by means of the cone bearings D and the back fall of the grinding-chucks. From the arbor B motion is communicated to the worm-shaft I by means of the pulleys E e, and the revolution of the worms J at each end of shaft I communicates rotary motion to the wormwheels K, their shafts L, and the crank-disks M, which are attached to the upper ends of s'aid shaft-s.

By means of the crank-pins N, which we prefer to make adjustable in radial slots m, motion is given to the pitman or connecting rods 0, said rods connecting at their other ends with the pins P, attached to the tables Q, and said tables being rceiprocated (by the V motion of the pitmen) on their guides at in transverse lines to the faces of the grindingchucks G.

The work'holding chucks or supports, consisting of the plates R, with their supported arms S S S rest in the guides a a on the top of tables 0. By means of the screw-shafts T the plates R are made to move toward or away from the grinding-chucks, this motion being given either by hand, for which the handle T is provided on the screw-shaft T, or by means of the ratchet-wheel V, which can be made to engage with the pawl U at the end of each stroke, and thus turn the screw-shaft and feed the work toward the grinding-chucks. The pawl U is made adjustable, so that it can be properly set for any length of stroke of the connecting-rods O, or to any degree of engagement with the ratchet V, according as the feed is desired to be fast or slow.

The grinding material may be secured in place in any convenient manner. \Ve have discovered, however, that when a single large piece or mass of grinding material is used in the chucks its friction with the object being faced or ground generates so much heat that the journals and bearings of the machine are apt to expand and bend, so that the machine has to be stopped in order to allow them to cool off; and on the other hand we have discovered that where the grinding material is secured in the chuck in several separate and comparatively small pieces this undue generation of heat is not so apt to occur and the machine is therefore more efficient.

In order to provide a convenient and satisfactory way of securing small pieces of grinding material in the grinding-chucks, we have devised the chucks shown in the drawings, and particularly in Figs. 6 and 7. This chuck G is of cylindrical form, with a central bearing, in which the end of the arbor ii is inserted and secured by means of a key or other similar device. The end of the arbor projects slightly beyond the bearing provided in the chuck G, its projection forming a hearing for an eccentric or arm G c, which is socured in place by a nut, as shown, or any other convenient device. Around the outer edge of the chuck G are a number of cavities G a, running from front to back of the chuck and open in front thereof. Into these cavities smallcylindcrs or pieces of grinding material H are placed and secured by turning the cam G 0, so that it will press against them and clamp them between itself and the outside rim of the chuck-cylinder. For further security we' provide small pieces of steel or other metal G d and provide slotted holes passing into the cavities G a through the sides of chuck t". Small screws G e are inserted through these slots and screwed into threaded perforations in the blocks G d, which can thus be securely clamped in any part of the cavities G a and afford a base against which the cylinders H of grinding material can rest. I

The j ournal-box or other casting or forging to be faced is secured in the reciprocating work-holding chuck formed by the plate R, with standards S S S by means of the screws 3 s, by means of which it canbe properly adjusted and firmly held.

The double character of our machines enables us to get the full benefit of the power used in driving it, as one work-holding chuck can be made to make its forward or working stroke at the same time that the one on the other end of the machine is making its return or back stroke. It is, besides, a convenient and easily-constructed arrangement, and less expensive, both to build and operate, than any machines of similar character with which we are familiar.

The machine is obviously capable of many modifications, and we do not wish to be understood as liinitingourselves to the exact.

construction shown nor do we limit ourselves to a double machine, for while this is, as we have already stated, the best and most eilicient form in which our machine can be constructed, single machines can be constructed which will embody many of our inventions.

Having described our improvements in what we believe to be their best form, we claim as new and desire to secure by Letters Patent- 1. In a grinding-machine, a longitudinallystationary arbor secured in a frame, having a driving-pulley secured thereon, and a chuck for holding grinding material secured at its outer end, in combination with a reciprocating table secured on guides running transverse to the arbor, a Work-holding chuck secured on the reciprocating table in guides running parallel to the arbor, a feed-screw connecting the Work-holding chuck and the table, and gearing connecting the arbor with the reciprocating table to drive said table, whereby the motion of the work is maintained in unison With the starting, stopping, and speed of the grinding-chuck;

2. In a grinding-machine, substantially as specified, the combination .of the arbor secured to the frame, having a driving-pulley and a chuck for holding grinding material secured at its end, the Worm-shaft driven by said arbor, the upright shaft having a Wormwheel gearing with the worm on the shaft and a slotted crank-disk, the pitinan or connecting-rod uniting the crank-disk and Workholding table, said table having guides for directing its transverse reciprocating motion,

and the work-holding chuck secured in guides on the reciprocating table running transversely to its line of motion, all substantially as and for the purpose specified.

3. In a grinding-machine, substantially as shown and described, the Work-holding chuck secured on the reciprocating table and adapted to feed the Work toward the grindingchuck by means of a screw-shaft having a ratchet-Wheel secured upon it and adapted to engage With a pawl secured adjustably upon the frame of the grinding-machine, all as and for the purpose specified.

4. In a grinding-machine, the combination of a frame having bearings, an arbor having chucks for holding grinding material at each end, and having journals, reciprocating tables secured in guides running transverse to the arbor, and Work-holding chucks supported on the said reciprocating tables and in front of the grinding-chucks.

5. In a grinding-machine, the combination of the arbor B, having chucks at each end, and the shaft I, having worms J the Worm- Wheels K, having shafts L and crank-disks M, with radial slots m and pins N, the connecting-rods O, reciprocating tables Q, and v chucks R S, having feed-screws '1, all substantially as and for the'purpose specified.

' GEORGE XV. STRATTAN. GILBERT MCCULLOCI'I.

\Vitnesses:

J NO. D. BOWMAN, CHAS. E. KING. 

